Dubbed the usbDAQ/108 and usbDAQ/109, both compact modules include 35-V over-voltage protection on their analog input lines, and voltage sources to power sensors and external devices. Both products also use rows of screw terminals for connection to sensors and other signals.

The $145 usbDAQ/108 and $245 usbDAQ/109 feature eight channels of single-ended analog input at a ±10-V span, or operate differentially for four channels. In differential mode input ranges can be ±1-V, ±1.25-V, ±2-V, ±2.5-V, ±4-V, ±5-V, ±10-V, or ±20-V.

Both the usbDAQ/108 and usbDAQ/109 use successive approximation A/D converters. The usbDAQ/108 gives you 12-bit resolution, and can operate at up to 10-ksamples/s. The usbDAQ/109 operates at 14-bit resolution and at 48-ksamples/s.

Analog Outputs

Both device also include two 0 to 5-V analog outputs that can drive 5-mA into 50-ohm loads over a 0 to 5-V range. These output drivers slew at 1-V/us.

As for digital I/O, both modules include a dozen TTL/LVTTL/CMOS-compatible three-state lines, grouped in two channels of eight and four lines each. Each channel is programmable as an input or output. In the usbDAQ/108 the lines are open-drain types; in the usbDAQ/109 each channel is individually programmable as a push-pull line or as an open-drain.

Both modules also include a 32-bit edge counter.

Quick Start Software

In addition to shipping with a ready-to-use data logging application, both devices come with driver support for TestPoint, LabVIEW, and C programming. A free application and driver make both modules ready for measurement almost right out of the box.